ACKNOWLEDGEMENTS
We are thankful to the crew of R/V Trygve Braarud, Thor A. Klevjer, Anders Røstad, Rita Amundsen, Mathilde Lind, Linda Norvad and Anette Åkerström for great assistance in the field. A. Åkerström also counted the zooplankton samples. Two anonymous referees provided very valuable and constructive comments that were incorporated into the manuscript.